CVE-2021-26195 : What You Need to Know

An issue was discovered in JerryScript 2.4.0 leading to a heap-buffer-overflow in lexer_parse_number in the js-lexer.c file.

Understanding CVE-2021-26195

This CVE identifies a critical vulnerability in JerryScript 2.4.0 that allows a heap-buffer-overflow attack in the lexer_parse_number function.

What is CVE-2021-26195?

The vulnerability discovered in JerryScript 2.4.0 permits a malicious actor to trigger a heap-buffer-overflow by exploiting the lexer_parse_number function within the js-lexer.c file.

The Impact of CVE-2021-26195

If successfully exploited, this vulnerability could result in arbitrary code execution or denial of service attacks, posing a significant risk to affected systems.

Technical Details of CVE-2021-26195

The technical details of CVE-2021-26195 include:

Vulnerability Description

The vulnerability involves a heap-buffer-overflow in the lexer_parse_number function within the js-lexer.c file in JerryScript 2.4.0.

Affected Systems and Versions

All versions of JerryScript 2.4.0 are affected by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by crafting a malicious input to the lexer_parse_number function, leading to a heap-buffer-overflow.

Mitigation and Prevention

To address CVE-2021-26195, consider the following mitigation strategies:

Immediate Steps to Take

Update JerryScript to the latest version to eliminate the heap-buffer-overflow vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch all software components to prevent future vulnerabilities.
Implement strong input validation mechanisms to mitigate buffer-overflow risks.

Patching and Updates

Stay informed about security advisories from JerryScript and promptly apply patches to ensure system security.